/*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ANTKEEPER_SKY_PASS_HPP
#define ANTKEEPER_SKY_PASS_HPP

#include "renderer/render-pass.hpp"
#include "utility/fundamental-types.hpp"
#include "event/event-handler.hpp"
#include "event/input-events.hpp"
#include "animation/tween.hpp"

class shader_program;
class shader_input;
class vertex_buffer;
class vertex_array;
class texture_2d;
class resource_manager;
class model;
enum class drawing_mode;

/**
 *
 */
class sky_pass: public render_pass,
	public event_handler<mouse_moved_event>
{
public:
	sky_pass(::rasterizer* rasterizer, const ::framebuffer* framebuffer, resource_manager* resource_manager);
	virtual ~sky_pass();
	virtual void render(render_context* context) const final;
	
	void set_sky_model(const model* model);
	void set_sun_color(const float3& color);
	void set_sky_gradient(const std::array<float4, 4>& gradient);
	void set_time_of_day(float time);
	void set_blue_noise_map(const texture_2d* texture);
	void set_time_tween(const tween<double>* time);
	void set_observer_coordinates(const float2& coordinates);
	void set_sun_coordinates(const float3& position, const float2& az_el);
	void set_moon_coordinates(const float3& position, const float2& az_el);

private:
	virtual void handle_event(const mouse_moved_event& event);

	shader_program* shader_program;
	const shader_input* model_view_projection_input;
	const shader_input* sun_color_input;
	const shader_input* sky_gradient_input;
	const shader_input* mouse_input;
	const shader_input* resolution_input;
	const shader_input* time_input;
	const shader_input* time_of_day_input;
	const shader_input* observer_coordinates_input;
	const shader_input* sun_position_input;
	const shader_input* sun_az_el_input;
	const shader_input* moon_position_input;
	const shader_input* moon_az_el_input;
	const shader_input* blue_noise_map_input;

	
	vertex_buffer* quad_vbo;
	vertex_array* quad_vao;
	
	const model* sky_model;
	const vertex_array* sky_model_vao;
	drawing_mode sky_model_drawing_mode;
	std::size_t sky_model_start_index;
	std::size_t sky_model_index_count;

	float sun_angular_radius;
	float3 sun_color;
	const texture_2d* blue_noise_map;
	float2 mouse_position;
	std::array<float4, 4> sky_gradient;
	const tween<double>* time_tween;
	float time_of_day;
	float2 observer_coordinates;
	float3 sun_position;
	float2 sun_az_el;
	float3 moon_position;
	float2 moon_az_el;
};

#endif // ANTKEEPER_SKY_PASS_HPP